Brainteaser physics : hallenging physics puzzlers by Göran Grimvall PDF

By Göran Grimvall

ISBN-10: 0801885116

ISBN-13: 9780801885112

ISBN-10: 0801885124

ISBN-13: 9780801885129

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However, the pressure difference between the two sides of the opening O, (p0 + rgh) − p0 = rgh is constant. Therefore also the flow rate from O now becomes constant. It depends on how far down the tube T reaches, as given by the distance h. This situation prevails until the liquid surface inside the bottle has reached the lower end of the tube. When that happens, the air inside the bottle is in direct contact with the ambient atmosphere, and thus has the constant pressure p0. The flow rate decreases gradually until the flow stops when the level inside the bottle has reached the opening O.

1 Moving Backward? You ride an ordinary bicycle, in ordinary gear. Are there any points on the bicycle that don’t move forward relative to the road? 2 Heating Water In 1895 the first large-scale hydroelectric power plant was installed at Niagara Falls, New York, and by 1900 there were ten generators, rated at 5000 horsepower each. Suppose that we let this electric energy feed a giant electric heater placed in an exit tube after the turbines. Would that energy suffice to bring the water in the exit tube to boiling, or would it increase the temperature by not more than about 1 K (2 ЊF)?

It is now obvious, according to the schematic illustration (fig. 15) that the extra gravitational force from an underwater mountain gives rise to a small hump on the ocean surface. How physicists think. The mathematically minded physicist would say that the shape f(r ) of the ocean surface represents an equipotential surface for the gravitational potential. The gravitational force on a water element near the surface is directed along the gradient −∇f(r ). Here −∇f(r ) is a vector, which forms a normal to the surface described by f(r ).

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Brainteaser physics : hallenging physics puzzlers by Göran Grimvall


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